Fig. 4

Forest plots. (a) forest plot of HRs for SDOC in different subgroups. (b) forest plot of HRs for in-hospital mortality in different subgroups. (c) forest plots of HRs for long-term mortality in different subgroups. CKD (chronic kidney disease), BMI (body mass index), DM (diabetes mellitus), CHD (coronary heart disease), CI (confidence interval), HR (hazard ratio).